[llvm] [VPlan] First step towards VPlan cost modeling (LegacyCM in CostCtx) (PR #92555)

[via llvm-commits]

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@@ -1454,3 +1526,17 @@ VPValue *vputils::getOrCreateVPValueForSCEVExpr(VPlan &Plan, const SCEV *Expr,
   Plan.addSCEVExpansion(Expr, Expanded);
   return Expanded;
 }
+
+bool vputils::isUniformBoolean(VPValue *Cond) {
+  if (match(Cond, m_Not(m_VPValue())))
+    Cond = Cond->getDefiningRecipe()->getOperand(0);
+  auto *R = Cond->getDefiningRecipe();
+  if (!R)
+    return true;
+  // TODO: match additional patterns preserving uniformity of booleans, e.g.,
+  // AND/OR/etc.
+  return match(R, m_Binary<Instruction::ICmp>(m_VPValue(), m_VPValue())) &&
+         all_of(R->operands(), [](VPValue *Op) {
+           return vputils::isUniformAfterVectorization(Op);
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ayalz wrote:

nit: may be simpler the check the two operands of ICmp directly.

https://github.com/llvm/llvm-project/pull/92555